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JAENES
BPossible leakSeptember 17, 2026 announced

ちばぎん商店株式会社Data breach / unauthorized access incident

笹尾 祐太朗の写真Reviewed by Yutaro SasaoWritten by Leak Watch editorial team published ・ updated
Occurred on
Unconfirmed
Announced on
September 17, 2026
Severity
BIncidents centered on names and contact details.
Scale
Unknown
Main impact
The corporate website was illegally accessed and tampered with, potentially affecting information for approximately 192 individuals, approximately 722 corporations, and approximately 7,670 email-only recipients. Account information is included for about 31 of these.
Information involved
Email addressUser / member IDCard & payment dataPhone numberHome addressFull name
Cause / key point
The cause is under investigation.
Industry
Finance & insurance
Listing / capital
Unlisted
Sources
Last updated
October 20, 2026
Email addressUser / member IDCard & payment dataPhone numberHome addressFull nameHow severity is assessed →

Is this incident worth paying attention to?

Written & reviewed

笹尾 祐太朗の写真

Reviewed byYutaro SasaoFounder & CEO, MediaLeap Inc.

CEO of MediaLeap Inc. Working on both sides of web advertising and web media since 2013; founded the company in May 2025.

Review scope: cross-checking against primary sources (official and government announcements), verifying claims stay within the facts, and checking source attribution。Last reviewed:

Written by:Leak Watch editorial team (AI-assisted drafts verified against sources by the editorial team) · Reviewer profile · Request a correction

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Attack method classification: Unauthorized access (method undisclosed)(Breached, but the technique was not identified or disclosed)

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